Certain predictions of quantum theory are not compatible with the notion of local-realism. This was the content of Bells famous theorem of the year 1964. Bell proved this with the help of an inequality, famously known as Bells inequality. The alternative proofs of Bells theorem without using Bells inequality are known as `nonlocality without inequality (NLWI) proofs. We, review one such proof, namely the Hardys proof which due to its simplicity and generality has been considered the best version of Bells theorem.
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